Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd17b151a8815801…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e147202b7a7c4e514895ae9b2d9166b SHA-1: 226e0afa2c5d05b343ec83b0b06de4e467c03fcf SHA-256: dd17b151a8815801f8fcf1e3b046299c350dabb2b62403c9181892c2ca69db9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://circolosilverblufitnessclub.eu/userfiles/files/53527533489.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bbf6abff97dfed7b7cb24f0284fdd80d/88498708478.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/zolagetuwovotud.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/88104660401.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/af2a752829284d274f9b5c7259c922d3/mikazuvawixapanapanosej.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/21670431893.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb0dadb7d---naxawitebokezusetened.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161379f2d567f0---13705997902.pdfIn PDF document text
    • http://gaudi.tw/upload/file/56467105432.pdfIn PDF document text
    • https://la-klamm.org/Files/files/xaxezagovon.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6123f5b4a34e0d3f2a531e0a80f4f25c/duwatigalobonisodasetesi.pdfIn PDF document text
    • http://dmkert.hu/files/file/samukovizigeti.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/3607096153.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/rovozifitu.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/18843608883.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/mixev.pdfIn PDF document text
    • http://vswet.ru/f/vuwijexed.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/29055622640.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/73725989303.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161456a7b2b4c9---18490286924.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sup045gobtsjidkjlq9t4eud42/pexunu.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/12762384902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=martin+shaw+particle+physicsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10544 bytes
SHA-256: 2e07bdd3e2997ad60956ed4bcebbfc028d841bf5bc1d25031268f8172c27f6eb
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 16744 bytes
SHA-256: 0f5883695cafaef14f12b1b18b1be9a5ee4038f26b82002121f8234a901f9140
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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